The FMH allows for non-destructive testing of parts made from electrically non-conducting materials. These include plastics glass glass-fibre reinforced plastics GFRP natural-fibre reinforce plastics NFRP foams ceramics wood enameland composites based on these materials.The FMH is a stand-alone instrument. It includes a microwave module as well as a control and display module. Therefore, in basic functions it can be used without additional instruments. For detailed user-specific evaluations and for the documentation of test results an analogue interface, and, as an option, an interface to an eddy current system are available.